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EP0440273B1 - Eine Methode zur Herstellung von Glukose-Isomerasen mit geänderter Substratspezifität - Google Patents

Eine Methode zur Herstellung von Glukose-Isomerasen mit geänderter Substratspezifität Download PDF

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EP0440273B1
EP0440273B1 EP91200003A EP91200003A EP0440273B1 EP 0440273 B1 EP0440273 B1 EP 0440273B1 EP 91200003 A EP91200003 A EP 91200003A EP 91200003 A EP91200003 A EP 91200003A EP 0440273 B1 EP0440273 B1 EP 0440273B1
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Prior art keywords
substrate
glucose
enzyme
residues
altered
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EP0440273A2 (de
EP0440273A3 (en
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Anne-Marie Virginie Renee Lambeir
Wilhelmus Johannes Quax
Ignace Lasters
Jan Metske Van Der Laan
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Danisco US Inc
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Plant Genetic Systems NV
Genencor International Inc
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Priority to EP02018565A priority Critical patent/EP1264883B1/de
Priority to DK02018565.8T priority patent/DK1264883T3/da
Priority to EP91200003A priority patent/EP0440273B1/de
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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/90—Isomerases (5.)
    • C12N9/92—Glucose isomerase (5.3.1.5; 5.3.1.9; 5.3.1.18)
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes

Definitions

  • the present invention relates to the application of protein engineering technology to improve the properties of enzymes. Specifically, the present invention discloses a method for selecting amino acids which upon substitution give rise to an altered substrate specificity. The method is applied to glucose isomerases.
  • Glucose isomerases catalyze the reversible isomerization of glucose to fructose.
  • Fructose is nowadays commonly applied as sugar substitute due to its higher sweetness compared to e.g. sucrose and glucose.
  • glucose isomerases also show a high affinity for sugars other than glucose.
  • D-xylose, D-ribose, L-arabinose, D-allose and 6-deoxyglucose were found to be substrates of this enzyme.
  • the K m values of D-glucose, D-xylose and D-ribose were shown to vary from microorganism to microorganism and were reported to be in the range, of 0.086-0.920, 0.005-0.093 and 0.35-0.65 M, respectively.
  • the K m values for xylose are significantly lower than for glucose, which implies that the correct name for the enzyme is in fact xylose isomerase. Furthermore, the V max of the commonly used glucose isomerases is higher on xylose than on glucose, which also suggest that xylose isomerase is a better name.
  • glucose isomerase is active on different substrates it may be advantageous to alter the substrate specificity depending on the desired reaction product, the specific process in which it is used or the wish to avoid unwanted side-products.
  • the digestibility and the taste of feed for monogastric animals can be improved if glucose is converted enzymatically into fructose.
  • glucose isomerase is hampered by the xylose isomerisation activity, which causes an unwanted formation of xylulose in feed.
  • a glucose isomerase with no or reduced specificity (V max or K m ) for xylose would be preferred for application in feed pretreatment.
  • subtilisin Bacillus licheniformis and B. amyloliquefaciens serine proteases differ by 31% (86 amino acid residues) in protein sequence and by a factor of 60 in catalytic efficiency on certain substrates. By substituting 3 of the 86 different amino acids from the B . amyloliquefaciens sequence by the corresponding B . licheniformis residues the catalytic activity of the mutant enzyme was improved nearly 60 fold.
  • glucose isomerase no naturally occurring enzyme is known, which shows a better specificity for glucose than for xylose.
  • the above-mentioned method based on the comparison of active sites of homologous enzymes having a different substrate specificity, can therefore not be applied to glucose isomerase.
  • WO 89/01520 (Cetus) lists a number of muteins of the xylose isomerase which may be obtained from Streptomyces rubiginosus and that may have an increased stability. The selection of possible sites that may be mutated is based on criteria differing from the ones used in the present invention. More than 300 mutants are listed but no data are presented concerning the characteristics and the alterations therein of the mutant enzyme molecules.
  • the present invention discloses a method for selecting amino acids which upon replacement lead to an altered substrate specificity of a given enzyme. This method, which is generally applicable, is used to alter the substrate specificity of glucose isomerase.
  • Figure 1 shows a schematic representation of the active site of glucose isomerase from Actinoplanes missouriensis , derived from the three dimensional structure of the glucose isomerase - xylitol complex.
  • the inhibitor is shown in full detail in the centre of the figure.
  • Residue names are in boxes drawn with solid lines, solvent molecules in boxes drawn with dashed lines.
  • Metal binding sites are represented by ovals numbered 395 and 580. Dashed lines indicate electrostatic interactions: the thin dotted lines represent hydrogen bonds, the fat dashed lines the proposed ligation of the metals.
  • Strictly conserved residues are marked by an asterix. For non-conserved residues the substitutions found in nature are indicated.
  • Figure 2 shows the alignment of the amino acid sequences of glucose isomerases obtained from different microorganisms.
  • the complete sequence of Actinoplanes missouriensis glucose isomerase is given.
  • the amino acid sequence of Ampullariella glucose isomerase differs from that of the published sequences (Saari, J. Bacteriol., 169 , (1987) 612) by one residue: Proline 177 in the published sequence was found to be Arginine.
  • the Streptomyces thermovulgaris sequence has only been established upto amino acid 346. Undetermined residues are left blank. A dot indicates the absence of an amino acid residue at this position as compared to any of the other sequences.
  • the different species are indicated by the following symbols: Ami. Actinoplanes missouriensis DSM 4643 Amp. Ampullariella species ATCC 31351 Svi. Streptomyces violaceoruber LMG 7183 Smu. Streptomyces murinus Sth. Streptomyces thermovulgaris DSM 40444 Art. Arthrobacter species Bsu. Bacillus subtilis Eco. Escherichia coli Lxy. Lactobacillus xylosus The secondary structure assignment was made in the structure of Actinoplanes missouriensis . Helices in the barrel are enclosed by solid lines. Shaded boxes indicate ⁇ -strands.
  • Figure 3 shows a comparison of the H290N mutant (bold) with the wildtype-sorbitol-Mg structure.
  • the present invention discloses a method for selecting amino acids, in an enzyme, that upon substitution give rise to an altered substrate specificity.
  • the DNA seqence encoding this enzyme is altered in such a way that the encoded enzyme has one or more selected amino acid replacements.
  • the altered DNA is expressed in a desired host/vector system.
  • Changes in substrate specificity according to the present invention include all combinations of increase and decrease of V max and K m for both glucose and xylose. A person skilled in the art will understand that this encompasses the changes in other kinetic parameters. Furthermore, the specificities for other substrates will inherently be changed also. The proposed rules for changing the substrate specificity are not restricted to the mentioned substrates, they can be applied to other substrates. Among these are, D-ribose, L-arabinose, D-allose and 6-deoxyglucose.
  • the selected amino acid replacements can be engineered in the DNA encoding the glucose isomerase by methods well known to a person skilled in the art (e.g. site-directed mutagenesis).
  • the DNA encoding the glucose isomerase or its mutants may be cloned on an expression vector and this construct may be transformed to a host wherein the gene is expressed, the mRNA translated and preferably the mature protein, or a precursor, secreted from the cell. Subsequently the protein can be purified. Standard procedures can be found in Maniatis et al. (Cold Spring Harbor, 1st and 2nd edition, 1982 and 1989 respectively).
  • mutant glucose isomerase enzymes obtained by the expression of a gene encoding said glucose isomerase enzyme having an amino acid sequence which differs at least in one amino acid from the wildtype glucose isomerase enzyme, which mutant glucose isomerase enzyme is characterized in that it exhibits an altered substrate specificity.
  • double mutants instead of single mutants also double mutants may be obtained. Some of these double mutants, aimed at combining the desired properties, show that the properties are at least partially cumulative. Examples are provided, in the present application, of mutants with both an increased specificity for glucose and an increased stability.
  • the substrate specificity of the new enzymes can be tested on the substrate that is necessary for the desired application.
  • special attention is paid to the kinetic parameters concerning glucose and xylose as a substrate and also to the relative changes in these parameters.
  • Figure 1 shows a schematic map of residues around the active site of A. missouriensis . In the following methods are described to design mutants which have a higher relative specificity for glucose compared to the wildtype enzyme.
  • Single substitutions at these sites and/or combinations of substitutions at the different sites may lead to an improved activity either through relief of steric hindrance or by the modulation of polarity of the sugar environment.
  • Different properties such as modulating the affinity and/or catalytic efficiency for various substrates may be altered in this way.
  • the hydrophobic side chains 16Trp, 88Met, 135Val are unable to solvate the hydroxyl group.
  • the hydroxyl group of the 90Thr side chain is rotated away, exposing its methyl group to the inhibitor.
  • the water molecule (491) bridges 06 and 04 of the sorbitol.
  • the active site contains a number of water molecules bound at positions roughly corresponding to the positions of the O1, 02, 03, 04 and 05 of the inhibitor in the enzyme-sorbitol-cobalt complex.
  • the environment corresponding to the 06 position is not able to accommodate a water molecule. This provides additional evidence that the hydroxyl group on C6 is not properly solvated.
  • substitutions which have been made in the collection of target residues were aimed to increase the polarity of the environment of the substrate hydroxyl groups, particularly of the 06, and to increase the flexibility of the active site to accommodate the larger substrate.
  • 25Ala to Lys introduction of a positively charged residue at a distance of 6 to 8 ⁇ of the 01, 02 and 03 of the substrate. Disruption of the water structure in the interface. Displacement of 26Phe, which shapes the hydrophobic pocket accommodating the C1 aliphatic hydrogens of the substrate.
  • the removing or shifting of bound water molecules in the active site of mutant H290N is correlated with the observed increase in activity for glucose. Similar effects may be obtained by shifting other bound water molecules. Water molecules which are in a sphere of 4 A around atoms 03, 04, O5 or 06 of the substrate are candidates to be removed or shifted by mutating neighbouring amino acids.
  • D-glucose isomerase is synonymously used for D-xylose isomerase (D-xylose) ketol-isomerase (EC 5.3.1.5), an enzyme that converts D-xylose into D-xylulose.
  • the D-glucose isomerase from Actinoplanes missouriensis produced by engineered E . coli strains is designated as EcoAmi (DSM) GI.
  • DSM EcoAmi
  • GI EcoAmi
  • EP-A-0351029 specifically describes most of the techniques applied in this application and it is therefore incorporated herein by reference.
  • the enzymatic activity of glucose isomerase was assayed as described below (1 unit of enzymatic activity produces 1.0 micromole of product -D-xylulose or D-fructose- per minute; therefore, specific activity -spa- is expressed as units per mg of GI enzymes).
  • GI activity was assayed directly by measuring the increase in absorbance at 278 nm of xylulose produced at 35°C by isomerisation of xylose by glucose isomerases.
  • This assay was performed in 50 mM triethanolamine buffer, pH 7.5, containing 10mM MgSO 4 , in the presence of 0.1 M xylose.
  • the final concentration of glucose isomerase in the assay was ⁇ 0.01 mg/ml, this concentration was precisely determined, prior to dilution in the enzymatic assay mixture, by absorption spectroscopy using an extinction coefficient of 1.08 at 278 nm for a solution of enzyme of 1.0 mg/ml.
  • D-Sorbitol Dehydrogenase Coupled Assay enzymatic determination of D-xylulose was performed at 35°C as previously described (Kersters-Hilderson et al., Enzyme Microb. Technol. 9 (1987) 145) in 50mM triethanolamine, pH 7.5, 10mM MgSO 4 , and 0.1 M xylose, in the presence of ⁇ 2 x 10 -8 M D-sorbitol dehydrogenase (L-iditol : NAD oxido-reductase, EC 1.1.14), and 0.15 mM NADH.
  • the final concentration of glucose isomerase in this assay was ⁇ 2.5 x 10 -3 mg/ml, this concentration was precisely determined as described above.
  • GI activity can be assayed by the measurement of D-fructose produced during the isomerization reaction using the cysteine-carbazole method (CCM) which is based on the reaction of ketosugars with carbazole in acids to yield a purple product (Dische and Borenfreund, J. Biol. Chem. 192 (1951) 583).
  • CCM cysteine-carbazole method
  • the D-fructose produced during the isomerization reaction can be determined enzymatically using sorbitol dehydrogenase and NADH.
  • V max /K m As a measure of specificity the quotient V max /K m is sometimes used (Wells et al ., ibid). For mutants the V max /K m values for xylose and for glucose were routinely calculated. Measurements for xylose parameters are carried out at 35°C, whereas glucose parameters are determined at 60°C. These temperatures are chosen for practical reasons. To find out whether conclusions about relative specificity are generally applicable independent of the measurement temperature, some measurements on xylose were performed at 60°C for both wildtype and mutant enzymes. It was found that conclusions that could be drawn concerning steady-state kinetic parameters at 60°C were similar to those at 35°C.
  • Table 3 summarizes measured K m values from various mutants compared to wildtype enzyme. It can be seen that all of these mutants have a lower K m for glucose. This means that the binding of the substrate glucose is enhanced. Moreover, for some of the mutants the K m for xylose has not improved but became worse, as exemplified in Table 2. Thus, mutants M88S, T90S, T90SV135Q, V135Q, H290N, K294Q, H243N have acquired a better K m xylose/K m glucose ratio as compared to the wild-type enzyme.
  • Example 3 Glucose isomerases with enhanced catalytic activity on glucose
  • Glucose isomerase mutants with enhanced catalytic activity on glucose are E186D, L258K, H290N and combined mutations with H290N.
  • L258K was not selected using the criteria described in the general methods as the leucine at position 258 is about 10 ⁇ away from the substrate or inhibitor.
  • V max relative to wildtype V max is shown. An increase from 8,9% to 43% is shown. This will give rise to a faster isomerisation of the preferred substrate glucose.
  • the V max for glucose is expressed in micromoles/min/mg.
  • Mutant H290N shows a V max for glucose of 41.80 which is significantly better than the wildtype enzyme. Moreover, the V max xylose has not improved. The ratio V max glucose/V max xylose of H290N has therefore been improved, rendering this mutant more into a "true" glucose isomerase.
  • the hydroxyl group of 52Thr hydrogen bonded to ne2 of 290His in the w.t. structures, can no longer hydrogen bond to 290Asn.
  • the introduction of a water molecule at this position, which forms a hydrogen bond to 52Thr forces a reorientation of the side chain of 88Met in the mutant structure as compared to wildtype.
  • the 52Thr side chain hydrogen bonds in the mutant to the main chain hydrogen of 53Phe (d 2.23 ⁇ ).
  • Example 5 Glucose isomerase with an improved substrate binding
  • the relative specificity is defined as the V max /K m ratio for xylose divided by the V max /K m ratio for glucose. Therefore, if the number is smaller than for the wild-type the relative specificity for glucose is increased.
  • Substrate specificity can also be changed by amino acid replacements resulting in amino acids that show a greater side-chain flexibility.
  • the space created by the 88Met to 88Ser mutation is filled with an additional water molecule.
  • the observed alternate side chain locations and the slight movement of the barrel allow the introduction of another water molecule and the movement of a water molecule in the C6 hyrdoxyl direction of the substrate.
  • Mn 2+ can be used as a bivalent cation during isomerisation.
  • Mn 2+ is not commonly used in commercial isomerisation processes, its use can be envisaged for applications in which metal ions can be removed from the product or in which metal ions are not relevant for the quality of the product.
  • E186Q shows an improved catalytic activity towards glucose in the presence of Mn 2+ , see Table 7: E186Q V max ( ⁇ moles/min/mg) Km(mM) Conditions Xylose 5.4 3.15 35°C, 1mM Mn, pH 7.5 Xylose 14.4 7.83 35°C, 2mM Mn, pH 6.4 Glucose 22.6 387 60°C, 1mM Mn, pH 7.5 Mn 5.63 0.01 35°C,100mM xylose,pH 7.5 Mn 14.5 ⁇ 0.03 35°C,200mM xylose,pH 6.4 Wildtype V max ( ⁇ moles/min/mg) Km(mM) Conditions Xylose 8.6 13.2 35°C, 1mM Mn, pH 7.5 Glucose 6.5 1537 60°C, 1mM Mn, Ph 7.5 Mn 10.2 0.0048 35°C,100mM xylose,pH7.5
  • V max glucose is 3- to 4-fold as compared to the wild-type enzyme.
  • K m glucose is 4-fold. Since 186E is in the vicinity of the UP metal position (see Figure 1), it can be envisaged that 186Q is in better concert with the larger Mn 2+ radius than with the Mg 2+ radius.
  • Mutant H290N shows an increased activity on glucose as can be seen in Table 4.
  • Table 6 shows that the specificity for glucose is also increased in this mutant.
  • This mutant was immobilized as described in EP-A-351029 (Example 7 of that application).
  • Application testing of the wildtype and this mutant glucose isomerase was performed as described in the same application (Example 8).
  • the stability is indicated by the first order decay constant (K d , the lower the decay constant the more stable the enzyme).
  • Table 8 gives the K d values for the wildtype and mutant glucose isomerases. Decay constants for wildtype and mutant glucose isomerase, immobilized on Lewatit K d (x 10 6 sec -1 ) Wildtype 2.5 H290N 3.1 K253R 0.7 H290NK253R 1.6
  • H290N is destabilized as compared with the wildtype glucose isomerase.
  • K253R was found to stabilize the wildtype glucose isomerase by a factor larger than three. Combination of H290N with the stability mutation K253R shows that these characteristics are additive.
  • Table 4 it can be seen in Table 4 that the activity of K253RH290N on glucose is not negatively influenced by the stability mutation, on the contrary the double mutant shows an even higher activity on this substrate than mutant H290N.
  • the specificity is concerned, in Table 6 it can be seen that the K253R mutation does not substantially influence the specificity of the H290N mutant.
  • activity mutants can be stabilized by introducing mutations that have been shown to stabilize the wildtype enzyme.

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Claims (9)

  1. Verfahren zur Herstellung eines Enzyms mit einer veränderten Substratspezifität durch Veränderung einer Aminosäure, die ausgewählt wird nach einem Verfahren, das die folgenden Kriterien umfasst:
    (a) Auswahl sämtlicher Reste und kristallographisch zugeordneter Wassermoleküle, die innerhalb eines die Atome des Substrats oder eines analogen Substrats oder eine Inhibitorbindung im aktiven Site umgebenden Bereichs von 4 Å wenigstens ein Atom aufweisen;
    (b) Auswahl sämtlicher Reste, die im van-der-Waals-Kontakt mit den durch die Auswahl gemäß Kriterium (a) erhaltenen Resten und Wassermolekülen stehen;
    (c) Aussonderung jener Reste aus der gewählten Liste von auf den Stufen (a) und (b) identifizierten Reste, die im Fall von oligomeren Enzymen an Katalyse-, Cofaktorbindungs- (z.B. Metallionen und Nucleotide) und essentiellen Intersubeinheiten-Wechselwirkungen teilnehmen;
    (d) Aussonderung jener Reste aus der gewählten Liste von auf den Stufen (a) und (b) identifizierten Resten, welche die Strukturrolle der ausgewählten Reste stören.
  2. Verfahren zur Herstellung eines Enzyms mit einer veränderten Substratspezifität nach Anspruch 1, das außerdem dadurch gekennzeichnet ist, dass eine oder mehrere der nachfolgenden Wechselwirkungen und Eigenschaften verändert werden:
    e1) sterische Hinderung durch Veränderung der Restgröße;
    e2) Hydrophobizität/Polarität der Substratumgebung;
    e3) Solvatisierung der Substratumgebung entweder durch Bereitstellung von Seitenketten, die durch Wasserstoffbindung an Gruppen im Substrat solvatisiert werden, oder durch Substitutionen, welche die Wasserverteilung in der Substratumgebung verändern;
    e4) Flexibilisierung der einzelnen Reste, Segmente oder der gesamten Proteinstruktur durch Substitutionen, welche H-Bindungsnetzwerke zerstören, die lokale Packungsdichte in der Substratumgebung vermindern oder Hohlräume einführen.
  3. Verfahren nach Anspruch 1 oder 2, bei dem das Enzym Glucoseisomerase ist.
  4. Verfahren nach Anspruch 1 oder 2, bei dem die veränderte Substratspezifität für ein spezifisches Substrat Vmax verändert ist.
  5. Verfahren nach Anspruch 4, bei dem der Vmax-Wert für das Substrat höher ist als für das natürlich vorkommende Enzym innerhalb eines spezifischen Temperaturbereichs.
  6. Verfahren nach Anspruch 1 oder 2, bei dem die veränderte Substratspezifität für ein spezifisches Substrat Km verändert ist.
  7. Verfahren nach Anspruch 6, bei dem der Km für das Substrat niedriger ist als für das natürlich vorkommende Enzym innerhalb eines spezifischen Temperaturbereichs.
  8. Verfahren nach Anspruch 1 oder 2, bei dem das Enzym wenigstens ein erstes Substrat und ein zweites Substrat aufweist und das Verhältnis Vmax des ersten Substrats/Vmax des zweiten Substrats höher ist als das des natürlich vorkommenden Enzyms.
  9. Verfahren nach Anspruch 1 oder 2, bei dem das Enzym wenigstens ein erstes Substrat und ein zweites Substrat aufweist und das Verhältnis Km des zweiten Substrats/Km des ersten Substrats höher ist als das des natürlich vorkommenden Enzyms.
EP91200003A 1990-01-04 1991-01-02 Eine Methode zur Herstellung von Glukose-Isomerasen mit geänderter Substratspezifität Revoked EP0440273B1 (de)

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Application Number Priority Date Filing Date Title
EP02018565A EP1264883B1 (de) 1990-01-04 1991-01-02 Glukose-Isomerasen mit geänderter Substratspezifität
DK02018565.8T DK1264883T3 (da) 1990-01-04 1991-01-02 Glucoseisomeraser med ændret substratspecificitet
EP91200003A EP0440273B1 (de) 1990-01-04 1991-01-02 Eine Methode zur Herstellung von Glukose-Isomerasen mit geänderter Substratspezifität

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EP90200029 1990-01-04
EP90200029 1990-01-04
EP91200003A EP0440273B1 (de) 1990-01-04 1991-01-02 Eine Methode zur Herstellung von Glukose-Isomerasen mit geänderter Substratspezifität

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JPH0556789A (ja) * 1990-10-29 1993-03-09 Juzo Udaka テルムス アクアテイカスのキシロースイソメラーゼ遺伝子、キシロースイソメラーゼ及びそれを用いたフラクトースの製造方法
TW284788B (de) * 1991-05-28 1996-09-01 L Air Liquide Soliete And Nyme Dour L Expl Des Proce
US5266475A (en) * 1991-09-19 1993-11-30 Michigan Biotechnology Institute Glucose isomerases with improved affinity for D-glucose
JP3193494B2 (ja) * 1992-01-03 2001-07-30 レール・リキード・ソシエテ・アノニム・プール・レテュード・エ・レクスプロワタシオン・デ・プロセデ・ジョルジュ・クロード 希ガスを使用し、グルコースから高フルクトースコーンシロップを製造する方法
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HU910018D0 (en) 1991-08-28
FI102543B (fi) 1998-12-31
DE69133232T2 (de) 2004-02-12
EP1264883B1 (de) 2010-04-14
EP1264883A2 (de) 2002-12-11
FI102543B1 (fi) 1998-12-31
FI910025A (fi) 1991-07-05
DE69133232D1 (de) 2003-05-15
DK0440273T3 (da) 2003-08-04
HUT61329A (en) 1992-12-28
ATE236974T1 (de) 2003-04-15
ATE464376T1 (de) 2010-04-15
JPH06277072A (ja) 1994-10-04
KR910014504A (ko) 1991-08-31
CA2033657C (en) 2001-03-20
AU642185B2 (en) 1993-10-14
PT96415A (pt) 1991-10-15
BG60323B2 (en) 1994-07-25
ZA9181B (en) 1991-10-30
FI910025A0 (fi) 1991-01-02
US5310665A (en) 1994-05-10
EP1264883A3 (de) 2002-12-18
CA2033657A1 (en) 1991-07-05
DK1264883T3 (da) 2010-07-19
EP0440273A2 (de) 1991-08-07
AU6865191A (en) 1991-07-11
DE69133632D1 (de) 2010-05-27
BR9100024A (pt) 1991-10-22
EP0440273A3 (en) 1992-01-22
RU2096457C1 (ru) 1997-11-20
IE910012A1 (en) 1991-07-17

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